| /* |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you under the Apache License, Version 2.0 (the |
| "License"); you may not use this file except in compliance |
| with the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, |
| software distributed under the License is distributed on an |
| "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| KIND, either express or implied. See the License for the |
| specific language governing permissions and limitations |
| under the License. |
| */ |
| package org.apache.edgent.samples.topology; |
| |
| import java.util.List; |
| import java.util.Random; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.edgent.console.server.HttpServer; |
| import org.apache.edgent.providers.development.DevelopmentProvider; |
| import org.apache.edgent.topology.TStream; |
| import org.apache.edgent.topology.Topology; |
| |
| /** |
| * Illustrates tagging TStreams with string labels. |
| */ |
| public class StreamTags { |
| public static void main(String[] args) throws Exception { |
| DevelopmentProvider dtp = new DevelopmentProvider(); |
| |
| Topology t = dtp.newTopology("StreamTags"); |
| |
| // Tag the source stream with |
| Random r = new Random(); |
| TStream<Double> d = t.poll(() -> (r.nextDouble() * 3), |
| 100, TimeUnit.MILLISECONDS).tag("dots", "hashes", "ats"); |
| |
| List<TStream<Double>> splits = d.split(3, tuple -> { |
| switch (tuple.intValue()) { |
| case 0: |
| return 0; |
| case 1: |
| return 1; |
| default: |
| return 2; |
| } |
| }); |
| |
| splits.get(0).tag("dots").sink(tuple -> System.out.print(".")); |
| splits.get(1).tag("hashes").sink(tuple -> System.out.print("#")); |
| splits.get(2).tag("ats").sink(tuple -> System.out.print("@")); |
| |
| dtp.submit(t); |
| |
| System.out.println(dtp.getServices().getService(HttpServer.class).getConsoleUrl()); |
| } |
| } |